Cory Booker raised $4.6 million in the second quarter for his New Jersey U.S. Senate campaign with help from some big names in business, entertainment, government and technology.

Booker, the Democratic mayor of Newark, received donations from Facebook Inc. chief executive officer Mark Zuckerberg and chief operating officer Sheryl Sandberg, according to a report Booker’s campaign filed this week in the Senate’s public records office. Zuckerberg’s plans to raise money for Booker’s campaign were first reported last month by Bloomberg’s Elise Young.

Christy R. Walton, the world’s richest woman — with a net worth of $37.8 billion, according to the Bloomberg Billionaires Index – donated to Booker’s campaign, as did Google Inc. Chairman Eric Schmidt.

New York City Mayor Michael Bloomberg donated to Booker last month and hosted a fundraiser for him this week. Bloomberg is the founder and majority owner of Bloomberg News parent Bloomberg LP.

Booker leads in polls ahead of the Aug. 16 Democratic primary and Oct. 13 special election. The winner will serve through at least November 2014, when an election for a full six-year term will be held. Democrat Frank Lautenberg died last month and Republican Jeff Chiesa is serving as senator as an interim appointee of Republican Gov. Chris Christie.

Booker began July with $4.5 million in available campaign funds, compared with $3.4 million for Rep. Frank Pallone and $1 million for Rep. Rush Holt. Pallone transferred $3.3 million from his House campaign committee and Holt sent $500,000. State Assembly Speaker Sheila Oliver, the fourth Democratic candidate, didn’t submit a fundraising report because she filed organizing papers just this week.

The leading Republican candidate, ex-Bogota mayor Steve Lonegan, raised $193,000 in the second quarter.